JP2000006361A - Printer for printing securities for securities sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer for printing securities for securities sheets which neet not be basically corrected in spite of a change in the format of the sheet. SOLUTION: The printer for printing securities is equipped with a paper sheet supply device, a transfer device for transferring sheets 1 and an application unit which applies a security image 7 supported by at least one ribbon. The ribbon is brought in so that it comes into contact with the sheet 1 and thereby the image 7 is applied to a specified point on the sheet 1. The application unit has a pad 52 registered with the point set on the sheet 1 and also has an applicator cylinder 5 which collaborates with an impression cylinder 4. The sheets 1 pass through a space between these cylinders 5, 4. In addition, ribbons 8, 8a are hooked between payoff reels B1, B2 and a takeup reel 25. In order to preheat the image 7, a heating device 13 for preheating the ribbons 8, 8a is installed in the upstream of the applicator cylinder 5 of the printer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a printing machine for printing security paper such as banknote paper, and more particularly to a paper sheet supply device, a paper transfer device, and an application unit for applying a security image. Provided, the image is supported by at least one ribbon, the ribbon being brought into contact with the paper such that the images are applied to determined points on the paper corresponding to the printed portions on the security paper. The application unit comprises an applicator cylinder having pads mounted thereon, the pads being arranged on the outer periphery of the applicator cylinder in register at said determined points, the applicator cylinder cooperating with the press cylinder The paper passes between the applicator cylinder and the press cylinder, the ribbon is mounted between two reels, and these two reels A winding reel winding the supply reel and ribbon feeding the ribbon is on Securities printing press stock paper running through parallel to the paper path.

[0002]

2. Description of the Related Art In order to make it difficult to counterfeit by re-manufacturing security paper such as banknote paper in particular by improving the quality of remanufactured products by using a photocopier, a film-type image is applied. It is a well-known practice to form security areas on these security papers by doing so. These images are often optically variable and have kinegrams or holograms that have appearance-changing properties that depend on the viewing angle. These images can be applied at high or low temperatures. Applicant's European Patent Application Publication No. 062
In US Pat. No. 5,466, an arrangement is disclosed that allows such images to be applied at low temperatures by using a two-part adhesive. A first portion of the adhesive is applied to a desired point on the note paper that is partially or completely printed on the sheet. The first portion of the adhesive is dried by passing the sheet through the catalyst. Thereafter, by using an applicator cylinder and a press cylinder, the image with the second portion of adhesive is applied to the previously selected point simply by the action of pressure.

In the printing press described above, the ribbon advances between the two cassettes along the generatrix of the applicator cylinder. The applicator cylinder is mounted in multiple pairs of these cassettes to allow several images to be applied to several points on the sheet in a single pass. Another type of equipment comprises an application unit for applying the optically variable image produced by the ribbon, one ribbon for each column to be printed, and a payout reel and winding. It is paid out between the reel. In the path between the two reels remote from the guiding and tensioning rolls and rollers there is a cylinder,
The body has a circumferential groove which is interrupted by a bridge. The ribbon passes along the circumferential groove. The sheet to be processed passes between the cylinder and the press cylinder, and an image transfer occurs each time the bridge passes over the press cylinder. The applicator cylinder is heated to activate the adhesive created by the image.
The contact between the bridge of the applicator cylinder and the image must last for a certain amount of time, since the adhesive should be heated sufficiently to achieve the desired effect. This means that the dimensions of the applicator cylinder and the press roll need to be constantly adjusted with respect to the dimensions of the sheet and the dimensions of the security paper partially or completely printed on said sheet. means. The ribbon carrying the image passes continuously and is synchronized with the sheet to which the image is to be applied. The equipment produced by this applicant is satisfactory.

[0004]

However, in order to maintain contact between the applicator cylinder and the image to be transferred by the end of the working time, the applicator is changed each time the paper type is changed. Fundamental modifications need to be made to the cylinder and press cylinder. In addition, prior to the transfer of the image, the press cylinder used to hold the sheet in contact with the applicator cylinder is used to hold the sheet along its entire length at the two ends of the sheet with respect to the direction of paper travel. Crush. In particular, for sheets that remain in contact with the applicator cylinder, before the sheet receives the image, the two small rollers press the sheet against the applicator cylinder near the edge of the sheet, thereby causing the applicator to The bridge of the torso is in intimate contact with the ribbon and allows the adhesive on the image to be applied to be raised to the desired temperature. The sheet then passes over a press cylinder of the same width as the sheet, which allows the image to be applied to the paper.

[0005] Thus, the pressure exerted by the two rollers, which initially ensures that the sheet is pressed firmly against the applicator cylinder, leaves an undesirable mark on the sheet. The object of the present invention is to propose a printing press which is similar to the printing press described above, but which does not have the disadvantages mentioned above.

[0006]

According to the present invention, there is provided a printing press comprising:
In order to preheat an image to be applied to a sheet of paper by simply contacting the pad against a press cylinder or impression cylinder, security printing presses use a heating device that preheats a ribbon with a heating device that preheats a ribbon. applicato
r cinder) is a security printing press for security papers mounted upstream.

The advantage of this printing machine is that it preheats the image to be applied to the sheet, so that the two longitudinal ends of the sheet are secured to ensure good contact with the applicator cylinder. This lies in the fact that the duty of using the pressing roller to be pressed can be avoided and the desired heating action can be obtained. Furthermore, the fact that simple contact between the pad of the applicator cylinder and the impression cylinder is sufficient to transfer the image from the ribbon onto the paper causes the printing press to change when the form of banknote paper or sheet is changed. No need to modify. For pads to be moved both axially and circumferentially, they need to be adapted to the new dimensions of the sheets and banknotes to be printed. The ribbon with the image to be applied needs to be prepared with a spacing corresponding to the new dimensions.

[0008] According to one alternative embodiment of the present invention, the printing press, in terms of ribbon savings, has the following features:
The ribbon is advanced in synchronization with the sheet passing between the applicator cylinder and the press cylinder. Means are attached to the security printing press to retract the ribbon over a distance approximately equal to the length of the sheet and to allow the ribbon to register with the next sheet.

The printing press thus makes it possible to save the length of the ribbon, and in other installations the ribbon is continuous even between the end of one sheet and the arrival of the next. Change the direction of travel. These sheets are always at least a few centimeters apart. These means have the advantage that the space between the end of one sheet and the leading edge of the next sheet slows the ribbon advancement, retracts the ribbon, and brings the ribbon to register for the next sheet. There is.

The means used to achieve these results include a pair of advance rollers located downstream of the applicator cylinder to advance the ribbon and a pair of advance rollers upstream of the preheating heater to retract the ribbon. Backing-up roller, a reading device for reading register marks provided on the ribbon, and the backing-up roller and the advance roller which are disposed upstream of the backing-up roller and downstream of the advance roller when the speed of the ribbon is changed. And an assisting means or an assisting device for providing an assisting action to the vehicle.

[0011] Advantageously, said assisting device for assisting the rollers is two vacuum boxes, into which the ribbon is sucked. This can create a certain amount of play as the ribbon advances. Thus, as will be explained later, this play can be used to damp sudden changes in speed. According to another preferred alternative embodiment of the invention, the ribbon is guided by a set of turn rollers and the ribbon is moved between an applicator cylinder and a press cylinder to apply an image to a second column of sheets. At least a second time at a position deviated from the axial direction of the applicator cylinder and the press cylinder.

According to another preferred alternative embodiment, the printing press comprises at least one second ribbon. This makes it possible to apply the image to the third column, and to apply the image to the fourth column if further turning means are provided on the press to make a second pass through the second ribbon. It is even possible. The second pass of the ribbon has the advantage of saving ribbon, since the image is not placed on the ribbon with a spacing corresponding to one length of the banknote paper. The images are placed half a distance apart. This means that when the ribbon passes the first time between the press cylinder and the applicator cylinder, it is for example an odd-numbered image applied to the sheet, and when the ribbon makes a second pass, It means that what is applied to the sheet is an even numbered image. Thereby, the length of the ribbon can be saved.

Finally, according to another alternative embodiment, if the entire strip, rather than an image of points, needs to be applied to the note paper, the equipment described above is replaced by replacing the pads with annular segments. This can be easily achieved by using. If the strips are to be applied over a certain length of the note paper, the length of this annular segment is equal to the length of the sheet or the length of the note paper.

According to another alternative embodiment, in order to obtain a better adhesive of the image to the sheet and to reduce any temperature differences of the various images,
The pads of the applicator cylinder can also be heated. The heating means
For example, selected from hot air, radiation, and infrared. These heating means can be formed from two parallel plates. One plate is located on the same side as the adhesive, and the other plate has the function of reflecting the heat of the one plate.

The present invention is disclosed in further detail with the aid of the accompanying drawings.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The printing press (FIG. 1) comprises two transfer cylinders 2, 3 which partially or completely receive a sheet 1, on which an image 7 from a ribbon 8 is received. Is attached. The sheet 1 arrives from the sheet storage remote from the printing facility via conventional means. The transfer cylinders 2, 3 can advantageously be suction cylinders. Next to the two transfer cylinders 2, 3, there is a press cylinder or impression cylinder 4 adapted to receive two sheets 1. Sheet 1
Gripping means 41 for gripping the front end with respect to the traveling direction of
The sheet is gripped, and the sheet is allowed to be conveyed in the advancing direction of the cylinder indicated by arrow F. Therefore, two protruding parts 42 separated by two grooves 43 are attached to the press cylinder 4. At one end of the protruding portion, a gripper 41 for gripping the front end of the sheet 1 is attached.

Above the impression cylinder 4 there is an applicator cylinder 5 which has a ring 5 for supporting a pad 52 for pressing the image 7 against the sheet 1.
1 is attached. The cylinder 6, which is a suction cylinder in theory, grabs the sheet 1 and transfers it to the storage device after the sheet has passed between the two cylinders 4,5. Before storing the sheet 1 with the security image attached thereto, the sheet 1 often passes through a cooling device to cool the adhesive.

The equipment of the present invention comprises two reels B1, B2
And each reel has a ribbon 8, 8a, respectively. As the ribbon passes between the cylinders 4, 5, the ribbons 8, 8a have images 7 arranged along the length of the ribbons so that the images are applied to the desired points.
Is provided. Here, the ribbon path will be briefly described.
It is understood that this facility is not the only viable facility. Starting from the reel B1, the two turning rollers or rolls 9, 10 are arranged in a heating device 1 in which the ribbon is guided towards the suction device 11 and the ribbon preheats the ribbon.
Before passing through 3, it is guided by two backing-up rollers 12 and then passes between press cylinder 4 and applicator cylinder 5. The use of the suction device 11 will be described later.
Next, the ribbon passes between the advance rollers 14 and the second suction device, and turns through the turn rollers 16, 17, 18, and 1
9 through the upstream part of the installation with the aid of rollers 20, 21 for a second pass. Even in this case, before passing along the second column for finishing between the press cylinder and the applicator cylinder, the ribbon passes through the suction device 11 'of the backing-up roller 12' and the heating device 13 and the turn roller. The direction is changed at 22, 23, and 24, and the process proceeds to the winding reel 25. Similarly, starting from reel B2, before being wound on the same reel 25, ribbon 8a passes twice between cylinders 4, 5 through generally similar equipment. Since the image to be applied on the two ribbons is not positioned on the sheet 1 at a distance equal to the distance between two successive images, the double of the ribbon between the impression cylinder and the applicator cylinder Can save the length of the ribbon. The images are arranged every half distance, and when the first length of ribbon passes between the applicator cylinder and the press cylinder, for example, an odd-numbered image is applied and the second length of the ribbon is applied. What is applied as the part passes is an even numbered image. Thus, about half the length of the ribbon is saved.

It is obvious that the distance between the rings 51 and the distance between the pads 52 are determined according to the size of the security paper 1a printed on the sheet 1. If the format of the sheet or the format of the security paper 1a is changed, the applicator cylinder 5
Or simply change or move the ring 51 and the pad completely, so that the pad is fully registered at the point where the image is to be applied.

It is clear that the ribbons 8, 8a used have a spacing between the images corresponding to the type of sheet 1 to be printed and the security paper 1a. The operation of this printing press will be described with the aid of FIGS. First, the ribbon is brought in register with the sheet 1 on which the image is to be transferred. For registration, the ribbon has regular marks 27 which are read by a reader 26. The reading device 26 is arranged downstream of the heating device 13 and upstream of the point where the ribbon contacts the two cylinders, the press cylinder 4 and the applicator cylinder 5. In order not to unnecessarily complicate the drawing, this reader 26 is not shown in the installation shown in FIG. The reading device 26 is a backing up roller 1
2 and advance roller 14 are controlled to accurately position ribbon 8.

The heating means 13 acts intermittently so as not to unnecessarily preheat the ribbon. This heating means can even simply heat the image to be applied, as the ribbon passes between the aforementioned cylinders. In the position shown in FIG. 1, the heating device 13 is stopped, the ribbon is also stopped, and the register mark 27 faces the reading device 26. When the paper sheet 1 approaches the line connecting the two axes of the cylinders 4 and 5, the ribbon moves in synchronism with the sheet 1 as can be seen in FIG. The sheet is pressed against the sheet 1 using. As the ribbon 8 begins to move, the heating device 13 is activated to heat the length of the ribbon or a subsequent image on the ribbon. In this particular example, it is the advance roller 14 that is assisted by the suction device 15 and pulls the ribbon forward. When the last image 7 to be transferred onto the sheet 1 is applied, by stopping the advance roller 14,
The heating action is stopped, the ribbon is stopped as well, and the backing-up roller 12 is operated with the help of the suction device 11 to apply tension to the ribbon. Press body 4
To apply image 7 to another sheet 1 above, ribbon 8 is retracted by a length approximately equal to the length of the sheet while press cylinder 4 and applicator cylinder 5 continue to rotate to the starting position. And is again positioned by the rollers 12, 14 under the control of the reading device 26 which reads the position of the register mark 27. During this operation, the heating device 13 is stopped.

Once the position of the cylinder 5 has come to imply that the front end of the next sheet 1 is aligned with the line connecting the axes of the two cylinders, the process described above is restarted. The two suction elements 11, 15 try to suck a part of the length of the ribbon 8, which assists the rollers 12, 14, and in some way form some play. On the other hand, if the ribbon suddenly accelerates, this play allows this acceleration effect to be absorbed without causing undesirable tension on the reel. On the other hand, if there is a deceleration effect, this play can also absorb speed differences by sucking in the length of the ribbon that continues to advance by inertia.

In accordance with a preferred embodiment of the present invention, pad 52 may also have a heating effect to provide a substantially constant temperature at which image 7 is applied to sheet 1. The steps described above with respect to the ribbon 8 since the action of applying the image along the generatrix of the applicator cylinder takes place, i.e. the action of applying to four security sheets of a row of security sheets printed on the sheet. Is applicable to the second length of the ribbon 8 and the ribbon 8a.

The dimensions of the pads correspond approximately to the dimensions of the image to be applied. It is desired that the temperature be adjusted so that the pre-heated image reaches the appropriate temperature application temperature. Since the application temperature depends on the adhesive used and the working conditions, the pad 52 should not be heated when the preheated temperature is high enough.

According to a variant embodiment, equipment may be used to apply the entire strip, rather than the image, to the note paper. In this case, instead of having a pad as shown here, a pad that is an annular segment is used. The pads of this annular segment allow the strip to be applied directly from one end of the sheet to the other or to the banknote paper only. In this case, it is necessary to have several separate annular sectors.

The heating means 13 for preheating is formed from two parallel plates. One plate located on the same side as the adhesive is a heating plate and the other is a heat reflecting plate.

[Brief description of the drawings]

FIG. 1 is a perspective view of a printing press according to a preferred embodiment of the present invention.

FIG. 2 is a partial side view of equipment that can explain the operation of the printing press.

FIG. 3 is a partial side view of equipment that can explain the operation of the printing press.

FIG. 4 is a partial side view of equipment that can explain the operation of the printing press.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sheet 4 ... Press cylinder 5 ... Applicator cylinder 7 ... Image 8 ... Ribbon 8a ... Ribbon 13 ... Heating device 52 ... Pad

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Kurt Georg Nagler, the inventor, Germany, 97084 Würzburg, Tebenbeck 4 (72) Inventor Johannes Georg Chaede, Germany, 97074 Wurzburg, Max-Heim-Strasse 8

Claims (10)

[Claims] 1. A printing machine for printing security papers (1a), in particular banknotes, comprising a paper sheet feeder,
It comprises a transport device for transporting the paper and an application unit for applying the security image (7), the image (7) being supported by at least one ribbon (8, 8a), the ribbon being (8, 8a) paper. And these images (7) are applied to the determined points on the paper (1) corresponding to the printed portions on the security paper (1a), and the application unit comprises a pad ( 5
2) comprising an applicator cylinder (5) with attached
These pads (52) are arranged on the outer periphery of the applicator cylinder in register with the determined points, the applicator cylinder (5) cooperating with the press cylinder (4) and the applicator cylinder and the press cylinder And the ribbon (8, 8a) is mounted between two reels, the two reels being pay-out reels (B1, B2) for feeding the ribbon (8, 8a) and A winding reel (25) for winding a ribbon, wherein the ribbon (8, 8a) passes in parallel to the path of the paper (1); In order to pre-heat the image (7) applied to the sheet of paper (1) by simply contacting 52), the printing press for securities printing uses a heating device (1) to pre-heat the ribbons (8, 8a).
3) a security printing press for security papers mounted upstream of the applicator cylinder (5). 2. In terms of saving the ribbons (8, 8a), the ribbons consist of an applicator cylinder (5) and a press cylinder (4).
Is advanced in synchronization with the sheet (1) passing between
When the sheet (1) leaves the applicator cylinder (5) while decelerating the advancing action of the ribbon (8, 8a) and waiting for the next sheet to arrive, the ribbon (8, 8a) is reduced to the length of the sheet. 2. A security printing press according to claim 1, wherein means are provided on the security printing press for retracting the ribbons (8, 8a) over substantially equal distances and allowing the ribbon (8, 8a) to register with the next sheet. Machine. 3. A pair of advance rollers (14) arranged downstream of the applicator cylinder (5) for advancing the ribbon (8, 8a), and a ribbon upstream of a heating device for preheating. (8, 8a), a pair of backing up rollers (12, 12 '), a reading device (26) for reading register marks (27) provided on the ribbons (8, 8a), and a backing up roller (1).
2, 12 ') and downstream of the advance roller (14) to assist the backing up roller (12, 12') and advance roller (14) when the speed of the ribbon is changed. Helping means to provide (11,
15. The security printing press for security paper according to claim 2, comprising: 4. The assisting means (11, 15) for assisting the backing up roller (12, 12 ′) and the advance roller (14) when the speed is changed,
4. The security printing press for security paper according to claim 3, wherein the two suction boxes are for sucking sections of the ribbon (8, 8a). 5. The ribbon (8, 8a) is guided by a set of turn rollers (16 to 21), whereby the ribbon (8, 8a) is moved between the applicator cylinder (5) and the press cylinder (4). 5. The security printing according to any one of claims 1 to 4, wherein the paper is passed at least a second time at a position shifted with respect to the axial direction of the applicator cylinder and the press cylinder. Machine. 6. The method according to claim 1, further comprising at least a second ribbon for applying the image at an axially offset position with respect to the first ribbon. A printing machine for securities printing of the security paper according to the above. 7. The image is a strip extending from one end of the security paper (1a) to the other end, the pad of the applicator cylinder being annular in a length corresponding to the length of the sheet (1) or security paper (1a). The security paper printing press for security paper according to any one of claims 1 to 4, which is a segment. 8. Pad (52) of the applicator cylinder (5).
8. A security paper printing machine for security paper according to any one of claims 1 to 7, further comprising a heating means. 9. The heating device for preheating is a high-temperature air,
6. The security paper printing machine for security paper according to claim 5, wherein infrared or radiation is used. 10. The preheating device comprises two parallel plates, one plate on the same side as the ribbon (8, 8a) radiating heat and the other arranged on the other side of the ribbon. 6. The security press of claim 5 wherein the plates are configured to reflect heat radiated by the one plate.